Require TempController(Smith)'s model params/ambient via setters; add comprehensive process() checks

TempController(Smith).__init__ no longer takes model_params/theta_amb -
set_model_plant_params() and the existing set_ambient_temperature() must be
called instead (mirrors components/plant/pot.py's own Pot constructor
refactor). temp_controller.py's now-pointless model_params/theta_amb
constructor placeholders (kept only for "compatibility" with Smith) are
dropped too.

Both TempController variants now raise a clear RuntimeError from process()
itself if set_params() wasn't called, instead of letting it surface deep
inside Pid.process() as an opaque "'NoneType' object is not subscriptable".
Smith additionally checks its internal models via Pot.is_configured() (new)
and raises if set_model_plant_params()/set_ambient_temperature() weren't
called either.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DkkuG48uHFCGKe6dPSERFk

components/pid/temp_controller_base.py

@@ -65,6 +65,16 @@ class TempControllerBase(APid):
 		self.pid_heat.set_params(params['Heat'])
 		self.pid_cool.set_params(params['Cool'])
 
+	def _require_params(self):
+		"""Called by each subclass's process() before doing anything else -
+		without it, a missing set_params() call would otherwise only
+		surface as an unhelpful "'NoneType' object is not subscriptable"
+		buried inside Pid.process() (components/pid/pid.py), once
+		process_pid() below gets to it."""
+		if self.params is None:
+			raise RuntimeError(
+				"{}.process(): PID gains not set - call set_params() first".format(type(self).__name__))
+
 	def on_state_entered(self, state):
 		pass